Abstract: The authors consider cancerous toxin can be sumarized for cancer-causing toxic factors that cause canceration of zang-fu organs and cancer cells. Cancerous toxin may be caused by several reasons: the external pathogens and internal pathogen; and cancer cells in the body organ can also be the source of cancerous toxin. Cancerous toxin has carcinogenicity， latency， transitivity， and it can cause malignant growths， high consumption and is hard to be treated. The treating method for the cancer can be applied to patients with solid tumor， metastasis or recurrence or transfer tendency. Treating methods include combating poison with poison， detoxification， removing blood stasis to treat toxin， resolving phlegm to treat toxin， and strengthening healthy energy to remove toxin.